Fukubi [Fukuform Type 2, Approximately 1.5 tsubo (18 sheets) included] This is Styrofoam. To ship via Mercari's 200 size service, it comes in a set of 18 sheets. Unused! ◎ "Fukuform Type 2" from the trusted Fukubi Chemical Industry, a floor insulation material developed for use between 1-shaku joists. ・It fits perfectly between joists, preventing cold air and warm air from below the floor. ※ These are items from a warehouse cleanup. They have been stored for a long time, so there are minor scratches. The photos show everything, so please take a look.